Machine for forming, bending, folding, and shaping heavy metal sheets



July 10, 1928. 1,676,733

c. G. HAWLEY MACHINE FOR FORMING, BENDING, FOLDING, AND SHAPING HEAVY METAL SHEETS Filed Feb. 6, 1925 5 Sheets-Sheet 1 July 10, 1928.

C. G. HAWLEY MACHINE FOR FORMING, BENDING, FOLDING, AND SHAPING HEAVY METAL SHEETS Filed Feb. 6, 1925 5 Sheets-Sheet 2 July 10, 1928. I 1,676,733

c, G. HAWLEY MACHINE FOR FORMING, BENDING, FOLDING, AND SHAPING HEAVY METAL SHEETS Filed Feb. 6, 1925 5 Sheets-Sheet 5 July 10, 1928.

C. G. HAWLEY MACHINE FOR FORMING, BENDING, FOLDING, AND SHAPING HEAVY METAL SHEETS 5 Sheets-Sheet 4 Filed Feb. 6, 1925 July 10, 1928. 1,676,733

C. G. HAWLEY' MACHINE FOR FORMING, BENDING, FOLDING, AND SHAPING HEAVY METAL SHEETS Filed Feb. 6. 1925 5 Sheets-Sheet 5 I aga CD; a w t: U (Q gm Patented Jnly 10, 1928.

.urn ran stares PATEnriorrieef.

oIIARLEs GILBERT HAWLEY, or CHICAGO, ILLINOIS, ASSIGNOR ToLoooMo'rIvn FIRE- BOX COMPANY, on CHICAGO, ILLINOIS, A eoRPoRArmn 0F DELAWARE.

MACHINE FOR FORMING, BENDING, FOLDING, AND sniirinennnvv ivIETALsI EE'rs.

-App1icatibn mammar e, 1925. "serial no. 7,230.

..,My invention relates to improvements in machines for forming, bending. folding and shaping heavy metal sheets such as parts of steam boilers, and has particular reference to that kind of a'lnaehineshowirin'my prior Patent No.1,488,4:9 l of April 1, 192%, especially designed for making what is now well known as the Nicholson'thermic siphon that said wings will operate in unison and will engage, with equal pressures, the sheet of metal being operated upon and will exert not only a folding action but a certain pinching action better to form the bulge in. the foldedsheet as will later appean V A. further object of the invention is to so construct the machine that instead of forming the bulge along the entirelength of the folded sheet as heretofore and thereafter flattening out one end of the bulge manually to provide thatportion which subsequently becomes the end flange of the. body, said bulge is made to terminate short of said end which is left flat in the formingof the siphon, the excess metal being displaced upwardly, thus reducing the cost of production and leaving the sheet in a better condition for-forming the end flange. V 7

Still a further ob'ect of the invention is to provide a simple and efficient means for Stripping orre-mo-ving the folded or formed metallic sheet from the forming horse or mandrel. V

The invention generally consists in the form, arrangement, construction and co: operation of the'part-s,-whereby the above mentioned objects, together with others that will hereinafter appear, are attainable and the invention will be more readily understood by reference to the accompanying drawings which. illustrate whatI consider at the present time to be the preferred embodiment thereof. I

In said drawings v Fig. is a view in front end elevation of ing Wings together.

a machine of the kind mentioned, embodying my invention.

"Fig.2 is a top plan view thereof. Fig. 3 is'a vertical sectional view on the line 3-3 of Fig.2 and shows the machine in side elevation. 1 'i Fig. 4 is'a detail vertical sectional View on an enlarged scale as taken on the, line 4- 4 of Fig.

or sheave embodied in my improved machine, with parts broken away to more clearly show the manner n which an asociated Fig. 5 is a detail .vlew of awindingpulleywant I link chain is connected thereto and which i will be more fully referred to later.

7 Fig. 6 is an enlarged detailhorizontal sectional view'through' apart of the stripping mechanism, the plane of the section being indicated by the line 6-6 of Fig. 3.

Fig. 7 is an enlarged detail verticalsec tional; view through another. part of" the strlpplng'mechanism, the plane of the see Fig.

tion being indicated by the' line "I of I 2 Fig.8 isa det-aiI horizontal sectional view on an enlarged scale as takens on the line 88 of 3 and shows in [plan elevation, themeansfor hingedly connecting thetoid Figs. 9, 10 and'll are detail perspective Views of parts shownin Fig; 8 and which w ll be more specifically referred to later. I

, Fig. 1211s a perspective.view of aportion of the forming horse or mandrel with the formed sheet thereon.

Figs. 13, 14 and-15 are detail vertical seetional views on an enlarged scale, as taken on the'lines' 13,13, 14'14 and 15%15, re-

spectively of Fig. 12. Fig. 16 is a detail horizontal sectional view as taken on the linev 16-16 of Fig. 12. 'f

Fig. 17 is a perspective view of tone of the forming blocksassociated with one of the forming wings.

18 is a 'view'in front end elevation of shaped article a-nd'I will describe the same with reference to the manufacture of such an article but this is tobe taken as by way of illustration only and hence I do not wish it to be construed as a limitation. V

The trough-shaped article above referred I to iswhat isnow-wel-l-known as a Nicholson thermic siphon which is adapted as a water circulating and steaming element in boilers and especially in locomotive boilers. As such siphons are of a comparatively large sizethe sheet employed for the formation thereof is relatively heavy so thatthe machines for forming them and as herein illus-' trated aretherefore of a comparatively large size.' As herein shown I provide a pit 1 in a floor 2 or the like .upon which th'e'structural work of the improved machine is. erected. In the median line of the pit provide a vertically disposed mandrel orhorse 3, the

, bottom'end'4of which is firmly attachedor l anchored to the bottom wall or floor 5 of the pit. The, top end part of the said mandrel extends into aplane above that ofthe floor 2 and is formed to providean enlarged cylindrical horizontallydisposed ridge portion 6, which terminates short of the front end of the nandrel and tapers off to. meet the sides thereof as best shown at 6 in- Figs. 12 and 16. -The crosssectional shape of the mandrel or horse is such as determines the cross-sectional shape of the finished article.

Positioned a suitable distance above the I horse and extending transversely with re-' spectfthereto area-plurality of beams 7. Said beams are secured at theirends upon stringersS and 9 respectively, which extend parallel with, but are: equally spaced upon each side of the plane of said horse. Said stringers are suitably supported upon the topends ofv upright columns orposts 10 and .11 which are secured to andare braced from the floor 2 adjacent the side walls of the pit -1. .To one side of the structural work just described and suitablysupporte'd at one end uponthe columns 11 is a. platform 12 arranged in a horizontal plane below that of the beams 7. The other 'endof said platform is supported on shorter upright columns 13. This platform is the control. plat- 1 form for the machine, which as before mentioned is of a considerable size and, so that the operator may easily gain. access to said platform, I provide a ladder 14 therefor.

About the platform 12 is arranged a guard railing 15 for the operator. V

16 and17 indicate, respectively, two hori zontal shafts which are equally spaced, one

on each side of the plane of andextending parallel with the horse or mandrel 3, said shafts being journalled in pillow blocks 16 and 17 respectively, mounted on the transverse'beams 7. On the shaft 16' are secured longitudinally spaced front and rear single pulleys or drums 18- -18 and on the shaft 17 are secured longitudinally spaced front and rear pulleys 19 and 20, respectively, arranged in pairs as shown in Fig. 2.

All of the pulleys 18, 19 and 20 are of the same size. 21 indicates a larger pulley g which is secured to the shaft 17 at a point substantiallymidway between the pairs of pulleys 19 and 20. This last mentioned pulley is operatively connected by'a cable 22 to the winding drum 1 of a hoisting engine 23 mounted on the platform 12. Said hoist- 1ng engine is ClllVQIIfFOlH an electr c motor 24 (alsolocated on said platform), through a gear reduction train and clutch 25, which clutch may be readily actuated by a control lever 26 arranged adjacent a controller switch 27 for said motor.) Secured to the pulleys OfBZlCll pairof pulleys 19 and '20 I Said pulley-is agrooved pulley V the pulley to receive a nut which securely 1,, positions said block in said groove. In said block is secured the threaded part of a clevis 32 to which the end link; of the chain 28 is secured. The chains 28 are secured to the pulleys 20 in the same manner.

v The opposite ends of the chains 28 and 29 I are connected'to pairs of lugs 33 'and 34, respectively, secured to wings 35 and 36, respectively. Said Wings are heavy Qor weighty members and perform their func-.

tion' by falling or dropping upon the metal sheets or plates to be folded. The chains 2829 are utilized to control the dropping of the wings and also for their elevation to that position from which they are dropped.

The wings may beheld in this last 'mentioned position when the machine is not in active operation, independent of thechains 2829 and to that end I provide the fol-- lowing construction. .011 said wings are securedinner and outer pairs of eyes 3738 arranged near the endsof said wings. eyes are adapted to b'e'engage'd by sets of hooks 3939 which are fixed to the ends of shafts 40-40. These shafts extend para-l lelwith the shafts 16 and 17 and are ,jour- Said nailed in suitable bearings mounted on the transverse beams 7. The hooks 39 of each set are all operatively connected'together by means of pivotally connected links 41-41 as shown inFig. 1 so that when movement is imparted to onehook, a similar movement is imparted to all of said hooks which normally hang pendant. When said wings are in face or wear resisting plates 44. Spaced somewhat from'the contiguous edges of said wings are pinch bars -45 whichare suitably secured in guides 4646 in turnfixed to saidwings as shown, the purpose of said pinch bars being to directly engage the sheet being formed and to co-operate with the mandrel to govern the form imparted to the sheet by the operation of the machine. The pinch bars 45 and their guides 46 terminate in substantially the plane of the tapered portions 6 ofthe ridge 6 and abut with forming block-s 46 secured to the inner surfaces ofsaid wings at their front ends. These forming blocks are provided with tapered or bevelled corner portions '46 which coact with the tapered portions of the ridge 6 to gradually flatten out the bulge in the folded sheet, as will later appear.

The wings 35 and 36 are operatively connected together against undesirable separation in a horizontal plane by 'means of the following construction: Secured to the contiguous edges of said. wings are bracket members 47 there preferably being twelve of saidbrackets secured to'each wing and disposed thereon as shown in Fig. 3. The said brackets each'include a plate part 47 which engages with the outer face of the as sociated wing and is secured thereto in any suitable manner, and a right angulardisposed part47 which overhangs the edge of said plate to terminate in longitudinally spaced bearing sleeves 4747 as best shown in Fig. 8. The brackets/47 at the front and rear ends of the wings are operatively connected together by links 48 (see Figs. 8 and 9) each of which includes front, rear and intermediate upwardly arched cross bars 48-48 and 48, respectively, between which the sleeves 47 of the brackets 47 engage and are-pivotally secured by pins 49 as shown in Fig. 8. These links 48 may be conveniently termed spotting links because they are each provided at one, end on their bottom side with a longitudinally extending tongue 50 which is adapted'to enter a groove 6 in the ridge portion 6 of the horse 8 when the wings are moving into their operative position with respect to the horse or mandrel 3.

In the initial movement of said wings the tongues 50 of .both links48 enter the end portions of the groove 6 in the ridge of the mandrel and act to hold the top end of the mandrel against lateral'movement and atthe same time insure registration. or alignment of the ends of said wings with respect to said mandrel or horse.

The. brackets 47 between the endmost brackets 47 are arranged in longitudinally spaced pairs, the pairs on one wing being disposed opposite those on the other wing. The brackets 47 of the first pair of brackets, spaced rearwardly form the spotting? links 48v at the end part of the. wings 3536 are. operatively connected together by center l.iI1l S'.51.52 somewhat similar to the. links 48before referred to except that said center links have no spotting tongues. Each link 5152 has an arched transverse body portion Ed -+52 respectively with longitudinal extensions '51 52 as best shown I, in Fig. 8, the ends of each body portion terminating in sleeves 5152 respectively adapted to engage between and align with the bearing sleeves 47 of the associated brackets 47.

instance the adjacent end links nth-52 of. J

said links 51-52 are spaced relatively close togetherfor a purpose to appear laten The ridge port-ion 6 of the mandrel begins to narrow down or taper transversely as at 6* in the manner before mentioned-as it approaches the plane ofsaid links, and the metal of the plate being operated upon at this point and from thereon out to the front end of the folded sheet is displaced upwardly by theforining blocks 46 and this upward displacement is taken care of or is permitted because ofthe transverse arched portions of the links 48, 51 and 62, which. portions are .spaced a distanceabove said ridge sufficient-to accommodate said upward displacement as best shown in Figs. 14 and 15.

The brackets 47 of each pair ofthe next four pair of brackets arespaced apart bifurcatedlinks 55,- one of which is shown in perspective in Fig. '11, and interposed between. the sleeves 47 of said. brackets are connecting links 56'each of whichlias end extensions 56 similar to the extensions of the links 51-52 before mentioned. Said links-56 are straight instead of arched and one of said links is shown in perspective in Fig. 10. Pins 57 pivotallyconnect the links 5556 with the sleeves 47 c of the associated brackets47, and the ends of said pins are connected by straight end links 57*as best shown in' Fig. 8. V r

. 58 indicate a plurality of uprigl'it guide posts or spotting columns, the top ends of which have sliding guiding bearings in bear-' .ing blocks 59 secured to thetransvers'e beams 7 injthe plane of the horse 8. The bottom end of the foremost spotting column 58 extends in between and ispinned to the adjacent end links 51 51 associated with the wardly thereof isan upright column .62 in the form of a channel bar, which column 62 is suitably braced by angularly disposed members shown in Figs. 2 and 3. Said column is connectedto the horse ormandrel by means of parallel spaced rails Gtupon which travel the wheels of a carriage 66. To said carriage is fixed the rear end of an inverted U-shaped stripper member 67. The front end of this stripper member which normally rests upon a rearward extension 6 of the ridge portion 6 of thehorse 3, as shown in Fig. 3 is slotted longitudinally for a predetermineddistance as indicated at 67" in Figs. 2, 3 and? for a purpose later to appear. The carriage 66 includes two .rearwardly extending arms 66 (see Figs. 3

and (3) between which is journalled adouble grooved pulley 68. Mounted on the column 62 below the rails (if-is a reversiblemotor driven winding drum 69, the operation of which is controlled from a controller switch 70 locatedon the platform 12. Mountedon the rear end of the horse Win the plane of said winding drum is "abearing block 71 in which a pulley '72 is. journalled. Also securedto the rearend of said horse is an upright cable stander arm 73 which stand or arm is bifurcated so a's'to straddlethe extension 6 of the ridge portion 6 and; permit the movement ofthe stripper member as bestshown inFig. 7. A cable 74 is connected at one end to the cablestand 73' and passes over the top of the pulley 68 in one groove thereof and then passes forwardly to be trained about the pulley 72 journalled inthe bracketll. From this pulley, said cable extends rearwardly to be wound a few turns about the motor driven winding drum 69 and the-npasses under the bottom of the pulley 68 in the other-groove thereof, the (other) end of said cable being fixed to the top end of the column 62 as shown in Fig.

From the foregoing,it is apparent that when the drum 69-is driven in one direction, the stripper member is moved forwardly of and onto the horse so as to strip the folded sheet therefrom and that when said drum is driven in the otherdirection the stripper member is withdrawn rearwardly from the horse into the'position shown in said Fig. 3.

"Should it be desired at any time to impart a, limited forward movementto the stripper plate is positioned. on the ridge portion 6 of the horse and at opposite endsthereof are provided pins 7 5 (see F ig. 2) which extend into the groove 6 of the ridge portion 6 of the horse to center and hold the sheet with respect thereto.

' It will be understood of course, that the sheet cannot be positioned on the mandrel or ridge portion until the wings 35and 36.

have been elevated into the horizontal posi tion shown in full lines'in Fig; land in which poistion they'are normally held by the hooks 39 as before described When the sheet has been thus positionedthe hooks 39 are removed from engagement with the eyes l7-38 of the wings, the weight of sa id wings now being sustained by the chains 28, 29 associated with the drum of the hoisting en ire 23, which drum is now locked b the iutch thereof. vVhen'the clutch 1S1?!- eased by the lever 26, the hinged wings will drop under their own 'weight to engage the sheet or plate 75. I

The engagement or settling of the weight of the wings upon said sheet serves to bend it, and as is apparentthe accelerating fall or movement of the heavy wings results in closing them together against the horse, as shownin dotted lines in Fig. 1. This practice might be followed in the case of articles to befoldedfrom comparatively thin sheets, thin being used in this instance relative to the strengthof thcsheetandthe weight, of the wings. which are allowed to'fall upon it. In dealing with sheets of relatively heavy or thick stocks and to avoid unnecessary jars or shocks, I prefer to start by first positioning the sheet on the mandrel and then slowly lowering the wings by letting i the clutch 25 slip. The first action of the wings thus allowed to slowly settle on the sheet, is to bend it so that its two sides or halves are bent at about a right angle to one another. This having been a'ccom; plished, the wingsare again lifted by means of the hoisting engine 23 and after said p0sition is reached, theyare held therein by the clutch 25. The clutch is then released and the heavy wings are allowedto drop onthe partially bent sheet. This operation or movement is repeated as many times'as may be necessary to complete the folding of the sheet around the mandrel and horse. In actual practice only a few of theheavy blows thusdelivered are required.

Lil:

' about and follows the formation of the ridge to provide the major portion of the bulge 75 of the siphon. During this partof the movement of the wings, and because of the positions which the bars 45bear with respect to the hinge pins 49, .53 and 57, said bars willswing into the vertical planes of said hinge pins and will forcibly engage parts of the sheet ust below the plane of the bottom of ridge 6. However, due to the long lever effect of the free ends of the wingsa peculiar action takes place in that the wings try to fulcrum about said bars as an axis which, of course, is resisted by the linksconnecting Due to this resistance thebars 45 move through said planes of said hinge pins and the -portions of said sheet between said bars and the undersides of the projecting parts of the ridge are pinched and displaced upwardly to produce ledges 7 5*" which connect said bulge with the side.

walls of the siphons. Said. ledges form the support upon whichthe bricks of the fire.- arch rest when the siphon ,is installed in a firebox. It will be apparent that the link arrangement between the side wings provide not only a hinged connection for said wings,

but also provide for the pinching or displacing of portions of the sheet to form said ledges. As before mentioned, the bulge portion 75 terminates short of the front end of the horse o and from thereon the excess metal in the middle portion of said front end of the sheet is displaced upwardly into a plane above that of the ridge as shown at 7 5 (see Fig. 12) by the forming blocks 4:6,

the tapered recesses 46 therein, so coacting with the tapered portions 6 of the ridge 6 as to'gradually flatten out the bulge and merge; the same into the side walls of the formed sheet as best shown in Figs. 12 to 16 inclusive of the drawings. This upward displacement is readily permitted by the links 48, 51 and 52 because of the transverse arched or curved formation of the same as beforedescribed. .By this construction it is not necessary to form the bulge the entire length of the sheet and to thereafter manually flatten out the same so that theiend flangeof the finished siphon may befpro duced. In theelimination of this step in forming the siphon, a great saving in time and'labor in making the siphon is attained.

From this description it is apparent that I am able in a very few minutes to fold the great'sheetof steel from which a Nicholson ther'mic siphon is formed. The pre-sliaped flat sheet clearly appears-in dotted lines in- Fig. 3 and in full lines in Fig. 12, and the cross-sectional shape thereofwhen foldedappears in Figs. 1, 4,13, 14 and 15, a front 74 connected'to the stand 73 and to unwind or pay on that end of the cable connected to the column62. Thismoves the stripper element '67 forwardly in close engagement with the ridge portion 6 and pushes the folded article off the front end of the horse. The windingdrum 69- is then driven in the other direction to restore the stripper member to its original or withdrawn position which is the position it is normally arranged in, as shown inFig. 3. y ,q,

,By the arrangementof the brackets and links relative to the wings, I "provide a strong and rigid hinge connection between said links and wingsand atthe same time, because of the relative arrangement between said hinge connection and bars 45, said bars said links together with their connection to the wings will insure uniformity of movement of said wings so that the folded sheet will truly conform to thehorse or mandrel. Again the tongue's5O of the link 48 not only insure registration of the wingswith respect to the horse but also act to so connect said horse and wings together in a manner preventing lateral swayingor'wabbling of the. ridge portion of the horse; I I

Inasmuch as the disclosure herein will readily suggest to others skilled in the art to which this invention appertains, various modifications thereof, I do not wish tobe limited to the specificlconstruction herein shown and described except as onlyjmay bev necessary by limitations inthehereunto appended claims. i

' I claimfas my invention:

L A device of the kind described embody-- ing therein a mandrel, a pair 'ofswingablemembers, afpluralityfof spotting columns for locating and-holding jsaid swingable members with respect to said. mandrel, brackets secured to said swingablemembers,

and means for operatively connecting'said brackets together, said l ast mentioned means being secured to said spotting columns.

2. A device of the kinddescribed embodying therein ainandrel, a pair of swingable member secured to the bottom end of each spotting column and means connecting said brackets with the ends'oi' said linkmembers.

A device of the kind describedembodying therein a mandrel, a pair of swingable members, a plurality of spotting columns for locating and holding said swingable members with respect to said mandrel, bracket members arranged in pairs and fixed to' said swingable members, and link members fixed to" the bottom ends of said spotting column,

said brackets-being pivotally connected to the" theends of said link membersI A. A device of the kind described embodying therein a mandrel, a pair of swingable v members, a j'ilurality of spotting columns for locating and holding said swingable members withfrespect to said mandrel, bracket members a ranged in pairs and fixed to said swing-able inemberaf link members fixed at their middle to the bottom endsof said spottin columns, some of said l nk members includingtransversely archedfcross barsto the ends of which said brackets are pivotally connected;

' Aideviceoi"the kind described embody ingtherein a mandrel, a pair of swlngable members, a plurality of spottng'columns for ,locating and holding said sfwiiigable mem' bers with respect to said mandrel, bracket members arranged impairs and fined to said swingable memljiersflmk members fixed at their middleto the bottom ends of said spotting columns, some of said link members in eluding transverselyarched cross bars to the ends of which said l wickets are pivotally connected, one cfsaid link members and said i mandrel having mterengagmg parts which assist said columns to locate said swingable members with respect to said mandrel.

A device of the 'kind described embodying therein a mandrei having a groove therein, pair'of swingable members, a plurality of'spottin'g collunns for locating and holding said swingable members with respect to said man lrel, bracket members arranged in pairs anddixed to said swingable members, link members fixed at'their m ddles to the bottom end oi. said spotting columns, the ends of I said link members being pivotallv-connected ranged above themandrel, a pair of swingable members, a plurality of members guided for sliding movement in sa d superstructure and operat vely connected to said swlngable ,members to locate the same withresp'ect to said mandr'el. means including flexible mem b'ers connected to said swmgable members for imparting 'move'mentto thermpulleys on new members'to locate the same with respect to said mandrel, means including flexiblemem bers connected to saidswingable members for imparting movement'to them, pulleys on said superstructure-over which-said flexible I members pass, means forfwinding and releasing said flexible members, and a pl-urality'of' hook members on said superstructure adapted to engage partsot' saidswingable members for supporting themin a pre' determined position independent oi said last mentioned means. Y Q r 9. A device of the kind described embodying therein a mandrel, a superstructure arranged above the mandrel, a p'airoi'swingable members arranged below the superstructure, and capable of movement toward and away from the mandrel, means including flexible members connected'tosaid swing able members for operating them, pulleys on said super-structure over which said flexible members pass, means for winding and releasing said flexible members, and means on said superstructure capable oi being moved into engagement with said swingable members to supportthem in a positionabove the mandrelindependent'of the said means for winding andrelea'sing said flexible members.

10. A device of the kind described embod in therein, a mandrel a su erstructure arranged above the-mandrel, a pair of swingablemembers arranged-below the sa perstructure. and capable of movement toward and away from the mandrel, means including flexible" members connected to said swinjgable members for operating them, pul-A' and away from said mandrel to'-f0rm asheet adopted to be moved longitudinally org-the upon said mandrel," a"stripper element;

Laverne mandrel and normally resting at one end thereon, means including a carriage at the other end of said stripper element, a support upon'which said carriage travels and means for causing a longitudinal movement of said stripper element and carriage'to-' able members, capable of movement toward and away from said mandrel to'iorm a sheetupon said mandrel, a stripper element adapted to be moved longitudinally of the -mandrel and normally resting at one end thereon, a carriage including antifrietion members at the other end of said stripper.

element, rails upon which the antifriction elements of the carriage are adapted {to travel, and means to reciprocate said stripper element with respect to said mandrel.

14. A device of the kind described embodying therein a mandrel, a pair of swingable members, capable of movement toward and away from said mandrel'to form a sheet upon said mandrel, a stripper'element adapted to be moved longitudinally of the mandrel and normally resting at one end thereon, a carriage including ant-lfriction members at the other end of said stripper element, rails upon which the antifriction elements of the carriage are adapted to travel, a reversible rotating drum arranged near the last mentioned end of said stripper element, and a flexible member associated with said drum and so arranged with respect to said stripper element as to impart a longitudinal movement in either directionto said stripper element, according to the direction of rotation of said drum.

15. A device of the kind described embodying therein a relatively high and narrow mandrel, a pair of swingable members, and means supported by said swingable members and coaeting with the mandrel to hold said mandrel against swaying.

16. A device of the kind described embodying therein a mandrel, apair of swingable members, and means operatively connecting said swingable members together, said last mentioned means including parts adapted to coact with the mandrel for holding said mandrel against swaying.

17. A device of the kind described embodying therein a mandrel having a groove therein, a pair of swingable members, and means supported by said swingable members ing.

and including apartadapted to enter the groove'in the mandrel to hold said mandrel against swaying. i

18. Adevice of the kind described em-' bodying therein a mandrel having a groove therein, a pair of swingable members, and means operatively connecting said swingable memberstogether, said means including a tongue adapted to enter the groove in ,the mandrel to hold said mandrel against sway- 19. A device of the kind described embodying therein a pair of SWlIlgtblCl11Q1l1- hers, bracket members fixed to, said members and including bearing sleeves, and rigid means connecting the bearing sleeves of the brackets on one member with the bearing sleeves of the brackets on the other member;

20. A. device of the kindzdescribed embodying therein a pair ofswingable vmembers; bracket members fixed to said members, and having parts overhanging the edges thereof, which parts include bearing sleeves, and means connecting the bearing sleeves oi the bracketson one member with the bearing sleeves of the brackets on the other member.

21. A device of the kind described eme bodying therein a pair of swingable members, bracket members fixed to said mem bers, each bracket including a plurality of longitudinally spaced bearing sleeves, devices entering the spaces between the sleeves of opposite brackets, and pins pivotally connecting said devices to said sleeves.

22. A device of the kind described embodying therein a 'pairof swingable mem bers, bracket members fixed to said members, each bracket including a plurality of longitudinally spaced bearing sleeves,, and connecting brackets also including spaced bearing sleeves aligned with the bearing sleeves of the brackets on said swingable members, and pin members pivotally connecting the aligned sleeve members together; 28. A device of the classdescribed embodying a mandrel having a ridge extending part way therealong, a pair of swingable members, means providinga hinged connection for said swingable members, and means on said winginembers operable in the movement of said wing members toward: sald mandrel for conforming a portion of a sheet to said ridge, and to that part of said'mandrel beyond the same, apart of said means acting to displace that portion of the sheet forwardly 01. said ridge into a plane above that of said'ridge. V H

24. A device of the kind described embodying therein a mandrel having a ridge portion, which terminates short of one end of the mandrel and :is tapered off toward.

said end,a pair of swingable members, means providing a hinged connection for said swingable members, and means on said swingable members for conforming a portion of a sheet to said ridge and its tapered portion and to displace the excess metal of the sheet beyond said tapered portion into said end, a pair of swingable members,

means providing a hinged connection for said swlngable members, pinch bars on said swingable members and forming blocks also on said swingablemembers, said pinch bars forming-a part-0f a sheet to the ridge up to,

its tapered portion andsaid forming blocks having'bevelled surfaces; coacting with said tapered portions of the ridge to flatten out said sheet forward of the ridge, said sheet, forward of said tapered portion of the ridge being displaced upwardly by the forming blocks. l r l In testimony whereof, I have hereunto set myvhand, this 31st day of December, 1924. I

CHARLES GILBERT'HAWLEY. 

